| // | |
| // Copyright 2018 The Abseil Authors. | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // https://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, software | |
| // distributed under the License is distributed on an "AS IS" BASIS, | |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| // See the License for the specific language governing permissions and | |
| // limitations under the License. | |
| // | |
| namespace absl { | |
| ABSL_NAMESPACE_BEGIN | |
| namespace debugging_internal { | |
| // Type of function used for printing in stack trace dumping, etc. | |
| // We avoid closures to keep things simple. | |
| typedef void OutputWriter(const char*, void*); | |
| // RegisterDebugStackTraceHook() allows to register a single routine | |
| // `hook` that is called each time DumpStackTrace() is called. | |
| // `hook` may be called from a signal handler. | |
| typedef void (*SymbolizeUrlEmitter)(void* const stack[], int depth, | |
| OutputWriter* writer, void* writer_arg); | |
| // Registration of SymbolizeUrlEmitter for use inside of a signal handler. | |
| // This is inherently unsafe and must be signal safe code. | |
| void RegisterDebugStackTraceHook(SymbolizeUrlEmitter hook); | |
| SymbolizeUrlEmitter GetDebugStackTraceHook(); | |
| // Returns the program counter from signal context, or nullptr if | |
| // unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of | |
| // ucontext_t on non-POSIX systems. | |
| void* GetProgramCounter(void* const vuc); | |
| // Uses `writer` to dump the program counter, stack trace, and stack | |
| // frame sizes. | |
| void DumpPCAndFrameSizesAndStackTrace(void* const pc, void* const stack[], | |
| int frame_sizes[], int depth, | |
| int min_dropped_frames, | |
| bool symbolize_stacktrace, | |
| OutputWriter* writer, void* writer_arg); | |
| // Dump current stack trace omitting the topmost `min_dropped_frames` stack | |
| // frames. | |
| void DumpStackTrace(int min_dropped_frames, int max_num_frames, | |
| bool symbolize_stacktrace, OutputWriter* writer, | |
| void* writer_arg); | |
| } // namespace debugging_internal | |
| ABSL_NAMESPACE_END | |
| } // namespace absl | |